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Devil/Halloween Question

Okay, I am not trying to start any sort of fight but I have a question due to the amazing amount of people I'm friends with on Facebook that refer to Halloween as "The Devil's Birthday"'s kinda a multi-part question so bear with me, here goes....Are angels created or do they just exist? Like would an Angel have any sort of specific birthdate? If they have a specific birthdate, who is tracking this? Would the "Devils Birthday" be the day he was born/created or when he fell from grace? I know this is a little trivial...but it just got me thinking.